System for treating waste incineration fly ash by microwave

Abstract

The invention discloses a system for microwave treatment of waste incineration fly ash, and relates to the technical field of fly ash treatment. The system comprises a fly ash quantitative adding system, a heating agent quantitative adding system, an inhibitor quantitative adding system, a uniform mixing stirrer and microwave heating equipment. The fly ash quantitative adding system, the heating agent quantitative adding system and the inhibitor quantitative adding system are respectively connected with the uniform mixing stirrer. The uniform mixing stirrer is connected with the microwave heating equipment. Fly ash, a heating agent and an inhibitor are quantitatively added into the uniform mixing stirrer respectively through the fly ash quantitative adding system, the heating agent quantitative adding system and the inhibitor quantitative adding system; the uniform mixing stirrer is used for uniformly stirring the added fly ash, the heating agent and the inhibitor; thereafter, the mixture is conveyed to a microwave heating device for heating treatment. The system is used for degrading dioxin in the waste incineration fly ash and reducing the leaching toxicity of heavy metals in thewaste incineration fly ash.

Description

technical field [0001] The invention relates to the technical field of fly ash treatment, in particular to a microwave treatment system for waste incineration fly ash. Background technique [0002] A large amount of dioxins are enriched in the fly ash, and the concentration can reach 5.7-7.5 μg I-TEQ / kg, which is much higher than the 3.0 μg I-TEQ / kg standard for landfill plants in GB16889-2008, which is a hazardous solid. waste. If the fly ash is directly landfilled, the released dioxins will reach 425 times the emissions in the flue gas. [0003] Currently, supercritical water oxidation, mechanochemical treatment, biodegradation, and photodegradation have all been used to treat fly ash. In particular, heat treatment methods, including melting, sintering and cracking treatments, are already in the pilot stage. Although pyrolysis treatment can degrade more than 99.9% of dioxins in fly ash, the temperature of the melting process needs to be as high as 1400 °C, and the energ...

AI Technical Summary

Problems solved by technology

Although pyrolysis treatment can degrade more than 99.9% of dioxins in fly ash, the temperature of the melting process needs to be as high as 1400 ℃, and the energy demand is extremely high

And in view of the composition characteristics of fly ash, its heat transfer performance is poor, the reaction time is long, and the energy loss is large

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